Replace a Character from a String

import java.util.Scanner;
class testHello{
        public static void main(String args[]){
                Scanner sc = new Scanner(System.in);
                System.out.print("Enter a string: ");
                String string = sc.nextLine();
                System.out.print("Enter a character to be replaced: ");
                char replace = sc.next().charAt(0);
                System.out.print("Enter the replacement character: ");
                char replacement = sc.next().charAt(0);
                String output = "";
                for(int i = 0; i < string.length(); i++)
                        if(string.charAt(i) == replace) output += replacement;
                        else output += string.charAt(i);
                System.out.print("The new string is: "+output);
        }
}